Pen grip



FIG. 1 is a front side bottom perspective view of a pen clip showing my new design;

FIG. 2 is a front elevational view thereof, which is a mirror image of the back elevational view; and,

FIG. 3 is a bottom plan view thereof.

The broken lines depicting environmental structure are included for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a pen grip, as shown and described. 